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Hey everybody, I've been playing with my EFI V2 for a few months now. I have an 06 LBZ GMC K3500 dually that can't seem to get better than 20 mpg. I have a K&N filter, straight thru 4" duals, and EGR disabled. I could really use a few pointers for tuning to better my mileage. I know other tuners...